Review on 🔌 Enhanced Performance with Parallax Power Supply 4400TAU Temperature Compensation Upgrade for Converters by Daniel Pyfer

Works as described, no battery surge in hot weather and no battery surge in cold weather. I haven't seen any signs of the batteries boiling over since I installed these over the summer and charged them from shore power. I see it doing a 4 hour boost cycle and when it completes the voltage drops. I wish there was an easy way for me to check how much current is being fed into the batteries after the boost cycle is complete. FIRST - make sure all power is off - this means all cables are disconnected from the battery and shore power is off. Ease of installation depends on your bus or trailer. From the system side it was easy - connect the "phone cable" from the back of the daughterboard to the motherboard, then the temperature cable to the front of the daughterboard and connect it to the battery. The tricky part can be the wiring, the easiest is to route the main wires from the battery to the power supply. Some will be a direct shot. I didn't have one, but it was doable, I had to pull out the bottom power supply to route the cable to the front of the unit. Skip the following steps if not necessary. Apologies for the quality of the photos, I took them for my own use and not for publication. In the picture you can see how the daughterboard and the motherboard are connected, and on the right you can see the wire that needs to be connected to the front of the daughterboard. Pulling out the bottom unit was easy, you just had to know how the wires connected to the top unit. In the general picture on the left there is a panel that needs to be removed. Behind it, see another picture, you can see a yellow connector with black wires going in - one going from the bottom block. You must take off that hat. The white wire in the bus is circled in blue, remove it. On the right were fuses, the blue and white wires coming from the top need to be removed. (See full picture, close up of fuses and close up of bottom unit with blue and white wires and jumper cable attached between main board and new board). Motherboards are connected. The wires from the lower unit that need to be reconnected to the fuse board are circled in blue. I used needle nose pliers to press it back onto the fuse board. It was easy and took a few hours as I'm new to this and had to think twice. I didn't take a picture of the temperature sensor cable attached to the front of the motherboard. Parallax 4400TAU temperature-compensated power supply for converters