A while back, we decided that we needed a 24v power source for various “testing” applications. This source needed to be durable enough for daily use by a wide variety of people without becoming damaged. It also needed to protect the device being powered, and be easy to maintain.
Given that tall list, Ben suggested a HobbyKing LiPo pack, 6S, 5Ah. With that start, we decided that it should have volt and amp meters for monitoring, as well as a circuit breaker to provideÂ positiveÂ power disconnect, and protect the battery (easily capable of 150A into a dead short).Meters were ordered from Ebay and the breaker was something out of an old UPS.
The blue enclosure is a waterproof storage box from Walmart, modified to pass through various connectors. Â It’s not waterproof at this point, but we’re more after the durability of the polycarbonate than the waterproof aspect anyhow.
Internally, there’s quite a bit going on. Â The battery is packed into a foamed-off area, while the other side contains the electronics, including the circuit breaker,ammeter shunt and all the connectors.
Charging is accomplished via a modified ATX connector (which re-presents the balance plug and main power leads), with a fuse to protect against abuse. The idea is that it’s virtually impossible to charge the battery improperly, or to break a relatively fragile balance connector.
Overall, it was a pretty straight-forward build, and cost around $90, including the battery and all the connectors.