Low Power B2B to charge mobility Scooter

[LithiumConvert]

I have just upgraded the AGM batteries in my mobility scooter to Lithium (now 48 Ah at 24 volts), so long range

All is working well with a mains charger, but I would like to able to charge it when not on EHU.

I think the answer is a 12v to 24v B2B connected on the leisure battery, like this:- (15 amps in half power mode is plenty)

Pro Batt Waterproof BBW series

Instruction Manual PDF Product Information PDF DC Voltage DC output input current (A) Size L x W x D mm Weight Kg Part Number 12 12 30 128 x 238 x 94 3.5 BBW1230 12 24 30 128 x 238 x 94 3.5 BBW122430 24 12 15 128 x 238 x 94 3.5 BBW241215 24 24 15 128 x 238 x 94 3.5 BBW242415 12 36 30 128 x 238 x...

sterling-power.com

But, at £500, it is a good sized addition to the cost of the batteries.

As much as I like Sterling Power products, can any body suggest a cheaper one?

• B2B
• 12v to 24v
• no more than 15amps.
• not too heavy

Solutions without using an inverter, please?

 

[autorouter]

The Victron Orion-Tr 12-24-15 is a 15A DC-DC charger that charges 24V batteries from a 12V alternator supply. If it can be set for the correct lithium profile then it might fit the bill.

 

[LithiumConvert]

The Victron Orion-Tr 12-24-15 is a 15A DC-DC charger that charges 24V batteries from a 12V alternator supply

The input can be from any 12v supplyy - so no issues there.

If it can be set for the correct lithium profile then it might fit the bill.

The constant voltage setting should be OK.

The dowside is that I don't use bluetooth. But many thanks for the suggestion.

 

[Wh05apk]

Would that only work with the engine running?
Would you not be better with an inverter which at least you could use for other items? (Assuming you have adequate battery capacity)

 

[Lenny HB]

I too think an inverter would be a better option, you can get a decent Victron one that will do the job for less that half that price but need to know the spec of your mains charger to advise size.

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[LithiumConvert]

Would that only work with the engine running?

It is a common mis-conception that B2Bs can only work off the alternator. They can be run off any 12v supply.

I would have it connected to run 24/7 off the leisure battery. But it would only be drawing power when the mobility scooter is plugged in to charge.

 

[LithiumConvert]

Would you not be better with an inverter which at least you could use for other items?

I too think an inverter would be a better option,

I am beginning to think that you both have a valid point. But I would still like to avoid having another inverter just for this purpose.

The existing inverter will not run the scooter charger. It is only for the laptop (and is not wired to the garage).

The leisure battery is well capable of supporting a scooter charger and mains leisure charger size is not an issue because, if I have mains, I can charge the scooter diirectly from EHU using its own mains charger. We have no other use for 240v supply.

But, thank you for the thoughts.

 

[autorouter]

The existing inverter will not run the scooter charger. It is only for the laptop (and is not wired to the garage).

You've probably been through this loop, but can't you run the laptop from a laptop car adapter, which is in fact a DC-DC charger? It will probably be more efficient than using an inverter.