Battery only · no roof needed
If you rent, live in a condo, or the roof simply isn't yours to touch, you can still stop losing power. A battery plugs into an ordinary outlet and comes with you when you move.
Three sizes. It charges off an ordinary outlet, and it comes with you when you move.
Who this is for
Solar panels need a roof you are allowed to change. A battery does not need a roof at all. These are the five situations we are asked about most.
Nothing can be drilled, mounted or rewired, and you may move next year. A battery is furniture, not a fixture.
You own your unit but not the roof above it, and the association will not approve panels on a shared structure.
The roof is real, but it is not yours to modify, and you are not going to spend on your landlord's property.
It is shaded, ageing or due for repair, or you are simply not ready to spend on a full system this year.
You work from home, or someone in the house depends on equipment that cannot stop. You do not want a generator in the hallway.
If you own your roof, a full solar system will almost always be the better long-term buy. A battery alone stores power; it does not make any. We will tell you that plainly.
Simple by design
No panels, no roof, no permits, no rewiring. It is closer to a very large, very quiet power bank for your home.
Step 1 · While power is on
You plug it into a normal outlet. It charges in the background, drawing a modest amount so it does not upset the rest of the unit.
Step 2 · When the power cuts
Fridge, lights, Wi-Fi, phones, laptop, fan, TV. The things that make an outage annoying instead of unbearable.
Step 3 · The switch
Changeover happens in about 20 milliseconds. Your work does not close, your router does not restart, your food does not warm up.
The battery fills quietly from an ordinary outlet, drawing a modest amount so it does not upset the rest of the unit.
The grid stops. In about twenty milliseconds the battery has the house, and your work does not close.
The grid comes back and the battery refills itself, ready for the next one. Nobody has to do anything.
A battery on its own does not lower your monthly bill. It protects you from outages and keeps you working. Savings come from solar, which you can add later.
After dark
The hours you sleep through a brownout are the whole product.
No roof, no permits, no rewiring. It plugs into an ordinary outlet and it moves with you.
Three sizes
The right size is decided by what you need to keep running and for how long, not by what fits the budget conversation. We work it out at the assessment. If what you actually want is something you can carry, there is a portable range further down.
1–2kWh
battery
A desk, a router, a phone, a fan.
Ask for a price
nothing installed, you carry it
≈15 h of desk load
5kWh
battery
The whole unit's essentials, overnight.
Ask for a price
supplied and set up · 2.5 kW output
≈13 h of condo essentials
10kWh
battery
Two units, or one long outage.
Ask for a price
supplied and set up · 5.0 kW output
≈26 h of condo essentials
The plug-in platform stacks to two units, 10 kWh. Beyond that is a site visit, not a catalogue pick. Hours are estimates at 90% usable battery, on the loads named. Your own figures are computed from your own appliances and printed in your proposal.
Portable power
The Venus E is built to sit outside and carry your evening while you forget it is there. These are the ones you pick up and take with you: a stall, a site office, a farm hut, a weekend away, or a desk with a laptop, the Wi-Fi and a fan on it.
All three take a solar panel, so when there is no socket to charge from, the sun does it. The house battery charges from a socket and only from a socket, because it is designed to live beside one. Out where there is no socket, that is the difference that matters.
The M1200 and the M2200 each take an add-on battery, so a station bought for a weekend away can become the one that carries a stall through a whole market day. You buy the second half when you need it, not before.
Arriving soon
1.03 kWh · 1,800 W out
The one you carry one-handed. Lights, the Wi-Fi, a fan and everybody's phones through a long evening, at fourteen kilos.
Panel input: 800 W
Grows: P1200-M add-on battery
See the full specification
Available
2.0 kWh · 500 W out
Waterproof, fanless and silent, rated to four thousand metres and good for ten thousand cycles. Built to be left running in a hut, a stall or a site office rather than carried in and out.
Panel input: 500 W
One unit, no add-on battery.
See the full specification
Arriving soon
2.24 kWh · 2,400 W out
Four AC sockets and enough output for tools, a fridge, or a whole stall for an evening. The biggest of the three, and it doubles.
Panel input: 600 W × 2
Grows: P2200 add-on, another 2.24 kWh
See the full specificationAbout one to two and a quarter kilowatt hours each, against 5.12 for a Venus E. They are not a smaller version of the same thing. A house battery is wired into your evening and left alone; a power station is a socket you can carry, and it earns its place when you are away from the wall rather than beside it.
Plenty of households end up with both, and there is no reason not to. Bring it up at the assessment and we will tell you which one your week actually needs.
The part nobody tells you
This is where most battery purchases go wrong. Aircon is the first question everybody asks, so here is the straight answer before you spend anything.
If what you want is two aircons running all night, a battery alone will not do it. We would rather tell you that here than at the assessment.
The usual alternative
In a house with a yard, a generator is a fair option. In a condo it usually is not, and in many buildings it is simply not allowed.
Where a generator still wins: long outages of several days, and heavy loads like non-inverter aircon or workshop tools. We will say so if that is your situation.
Marstek Venus E 3.0 · silent, fume-free, sits indoors or out
For condos and rentals
Always tell your association anyway. Rules differ building to building, and a quiet conversation beforehand is easier than an argument afterwards. We will put the specification in writing so you have something to show them.
Being straight with you
These are real products you can buy elsewhere, and we are not going to pretend otherwise. If you are technically confident and you only want a portable unit, buying it yourself is a perfectly sensible thing to do, and we would rather tell you that than talk you into work you do not need.
What you get by going through us is smaller than on a full solar system, and it is honest to say so. It is this:
The battery is not wasted. It carries over into a full JANARIX system: the same platform, with solar added on top and the capacity you already paid for still counting. That is the advantage of standing on one platform instead of buying whatever was cheapest that month.
Fair questions
One inverter aircon, yes, for a few hours on the 5 kWh, longer on the 10. A conventional non-inverter aircon draws a large surge when the compressor starts and will either trip the unit or empty it very quickly.
If aircon through the night is the actual requirement, say so at the assessment. The honest answer may be a bigger wired system, and we would rather tell you that first.
Nothing is drilled and nothing is attached to the building, so no approval is normally needed. We still recommend telling your association, and we will put the specification in writing so you have something to show them.
No. A battery alone stores power, it does not make any. It protects you from outages. Savings come from solar, which you can add later on the same platform.
It comes with you. It is an appliance, not a fixture. And if you move to a house with a roof, it carries over into a full JANARIX system with the capacity you already paid for still counting.
The first step
Thirty minutes, at your place. We list what has to stay running, check the circuit, and put a size in writing. Nothing to sign.