Helpdesk

I need a quite large energy backup (10.000mAh) but the battery-hats only go till 2000mAh

[nbsp]

so im thinking about buying a big battery and attach it to the wide-range-powerInput. but the question is:[nbsp]

- when the powergrid is working (so it doenst need to use the wide-range-powerInput), will it then slowly load the wide-range-powerInput-battery backup with energy?[nbsp] (or only an attached battery)

[nbsp]

other question:

- to avoid SD-card-failure (by powergrid failure) is it better to put it on mode2 (primary: wide-range[nbsp] [nbsp] secondary: microUSB)[nbsp] OR[nbsp] just mode1(primary: microUSB[nbsp] [nbsp] secondary: wide-range) beceause the change in powersupply in times of a poweroutage is fast enough that it woudnt effect the sd-card nor the process that the pi is running?

[nbsp]

last question:

- when using the official_usb-c_power_supply_from-raspberryPi will it be good enough to keep the pi on 5V[&]3A(for a long duration) OR[nbsp] [nbsp]it will but it wont have any capicity left to charge the battery back up with energy (and do you have a suggestion of a better powersupply for the microUSB-port)

[nbsp]

thanks for reading this and the hopefully handy answer,

sam

Hello,

thank you for your message.

It is sadly not possible to charge a battery through the Wide Range input. The only batteries that can be charged through the StromPi are our battery hats. You can use both modes equally. If one power source fails the StromPi is going to change to the other one that is selected. The StromPi is going to stay on in both cases.

3A is the maximum amount of power that the StromPi can deliver. Because of that it would not be possible for the Raspberry Pi to take up all of those 3A while simultaneously delivering power to the battery hat.

Yours sincerely,

Niklas Tritschler

Thanks for the answers you already gave me!!

Too make the powersupply of greater Wh. is it possible to attach a bigger battery to your strompi.battery.hat (of course on my own risk). Is there a connector used (like xhp-2 or something) or just wired straight too the board.

[nbsp]

with kind regards

sam

Hello,

it is generally possible to switch the battery that is used in the battery hat for a larger one. We don't really recommend doing this, because our batteries are tested for this specific use case. Every change that is done happens at you own risk.

If you still want to change the battery this information might be interesting for you:

Pinout: red = V+, black = GND, white = thermistor

The battery that is used has to be a single-cell LiFePO4 (Lithium iron phosphat battery). It must have a PCM (protection circuit module) and a NTC47k (ß = 4050) thermistor.

The nominal voltage of the Lithium iron phosphat cell is 3.2V. The end-of-charge voltage is 3.65V and the cutoff voltage is 2.5V.

The cell has to be able to withstand a constant current of 7A (original battery is a 1000mAh 10C battery).

You should also keep in mind that the circuit does not have a balancing function. Because of that you should not use more than one cell.

[nbsp]

In this picture you can see the connector of the larger version of the battery hat that we have: The battery hat XL.

[nbsp]

Yours sincerely,

Niklas Tritschler

Niklas

[nbsp]

thanks again for your clear and descriptive explanation!!

big thanks