Using a parallel charging board to power a robot with multiple LiPo packs (safety concerns)

[danny01]

Hello,

My name is Danny, a student studying robotics, and a newbie in the RC world.

I’d like your opinions on using a parallel charging board (e.g., Thor Pro 4 Ports, rated 40 A max output) as the power combiner for a robot running multiple LiPo packs.

My robot requires symmetric weight distribution across its system. It draws about 12–15 A peak at 12 V (after regulation).
A single 4S2P 8000–10000 mAh pack would give the runtime I want, but it’s too large to fit in the robot’s center. So I’m considering four identical 4S 2500 mAh LiPos, mounted symmetrically and connected in parallel (effectively 4S, ~10 Ah).

Question: Is it reasonable/safe to use a parallel charging board to power the robot during operation, and charge the packs in-place (robot off) through the same board, without unplugging individual packs from the robot?

I’m mainly worried about safety and failure modes caused by doing so. Any advice or recommended precautions would be appreciated!

 

[WickedFog]

Welcome to the forum. You don't need to use a parallel board. Simply solder up your own parallel harness to create your own parallel pack. Then you could use a wire gauge big enough to handle the load with no worries.

You say it draws 12-15A peak, but is that under load? If something gets caught in your drivetrain causing the load to spike, are you going to catch it before the parallel board starts a fire in your robot? Are you using fuses or breakers for protection?

Interesting project. Post pics if you can.

 

[CreepyQuarryCrawler]

Welcome! Cool project!

Personally, there's no way I would use that board for the purpose you're describing.

If you read the specs it says max charge current 2a. You'll smoke that thing.

I have used some from Progressive RC in the past with good results. They make quality gear.

Just look at the fuse ratings in each. Speaks volumes.

Edit:

I understand that you don't need it, but if you want to go that route it's available.

 

[PonkyKong]

You don't need a board. Just make a harness with 10 or 12 gauge silicone wires. The batteries will balance each other enough. Set lipo cutoff to medium for testing. Turn it off for the robot battle.