Frequently Asked Questions (FAQs)
This page contains the most frequently asked questions about the BankManager™.
All questions answered by Clark. Updated November 12, 2023.
Click each question below to reveal the answer.
Q: I've finished my physical install. How do I check that everything is working properly?
Here is the full test procedure:
Q: I just started my BankManager™ and it seems to think my lithium bank is full. It's not. What's up?
Q: I'm having trouble finding shielded wire for the current sensor. Any advice?
A: I originally over-specced the wire required. I use a “differential pair” connection, which is really robust. I just happened to have the perfect wire on my boat. Loads of people have found success by buying a piece of ethernet cable and cutting the ends off for the 4 wires that go from the BankManager™ (GND, Vref, Vout, +5) to the current sensor.
Q: I’m confused about the whole "switch" thing. How should I wire it?
A: Apologies, the original manual did not explain this clearly. We have since updated the manual with a clearer diagram. In short:
Q: How big/small can my batteries be?
Q: Can I use my starter battery as the “lead bank” in my hybrid system?
A: Sure. In fact, as long as you have enough lithium battery and charge capacity in your hybrid system such that you never deplete the lithium batteries, you have a condition where you will never cycle your lead bank. (If so, having deep-cycle lead batteries with thick plates is actually just a needless expense.) In this case, you are actually better served with cheap, readily available “starter” batteries, because with their thin plates, they are better at absorbing or serving power with minimal change to their voltage.
Q: My lead batteries are old. Can I still use them?
A: Old, sick batteries shouldn’t be used, but lead with a lot of life left in it can work fine, and will probably last for a surprisingly long time in a hybrid system.
Q: Tell me about my version number. What features do I have, or what am I missing?
// Ver 1.0 Initial offering
Q: I’m leaving my boat for a long time, what BankManager™ settings should I use?
A: There are many right answers here. Honestly, leaving your system set the way you normally use it isn’t all that bad. It’s much easier on the Li batteries than using commercial charge controllers without the BankManager.
Q: What benefits can the BankManager™ offer, beyond letting me add lithium batteries to my lead system? (~ Patron John F.)
Q: How will the BankManager™ approach affect my battery life?
Q: My BankManager is not connecting my lead and lithium banks. It should be, but it’s not. How can I fix this?
Q: Why use the bank manager instead of a DC-to-DC charger like Victron’s?
There are two reasons:
Q: My lithium battery stopped taking a charge, but my BankManager™ still says it’s connected. What's going on?
Most likely, the BMS inside your battery shut down the charging process because one or more of that battery’s cells is way out of balance. (If your battery has a working balancer this is unlikely to happen unless it's a new battery or you have been charging it slowly for a long time and recently charged it very quickly.) In short, you need to balance your cells.