Recent content by jameshowison

You are spot on with this assessment. I did the install and indeed found consumption numbers just like those you mention: Post in thread 'Hotspot Energy 48V DC air conditioners' https://diysolarforum.com/threads/hotspot-energy-48v-dc-air-conditioners.23937/post-550530 I ended up doing the...

Hah, good point, water tank is a type of battery :) I suppose there are differences in terms of space and energy loss over time, perhaps an electric battery would be smaller and lose less power when not being used, but definitely more expensive!

Any advance here? In the building science world (non RVs) there is a lot of effort around hot water heating. Yes, heat pumps are used (including split systems with the compressor outside), but a few people use electric tankless. Generally the problem here is that the electric demands are...

*somehow double posted, sorry!*

Do a manual J at coolcalc.com. That will give you room by room loads. Then you'll have some idea how much heating or cooling you need in each room. Compare that to the BTUs of the units you think you could fit. Otherwise everyone is just guessing.

I like the idea of flipping the cable! Would need a locking 30amp to locking 50amp, but that’s easy to get. And TT-30 female on the side of the RV somewhere. I don’t think I can use the second AC out in the Victron because AC-out-2 is always disconnected when grid power is not available on...

Yes, the generator interlock does this. The breaker for the generator inlet can’t be in the on position without turning off the main breaker to the grid. That’s all code compliant :)

Thanks. Confirmed we do not have any of these. House was completely re-wired a few years ago.

House has a generator inlet with interlock switch. RV has a 3000W Victron inverter with sufficient batteries/wiring to provide sustained 25amp of 120v. What do I need on the RV to enable connection to the generator inlet, to provide emergency power to the house? Two issues: 1. AC panel in...

FWIW, when my hotspot 48v system is running full tilt (like just after turning it on arriving at a campsite in 100°F weather (thanks texas), it does run at just over 1000W. So that is about 20amps (batteries are usually at ~51 or ~52v). Fairly quickly (20 minutes?) it scales back to running at...

Follow up to this. I re-torqued all the cells in the battery. There were quite a few that required substantial tightening (again, nothing physically lose but definitely below torque specs). I added the Nord Lock washers. Unfortunately that has not fixed the issue, Cell 04 is still...

Perhaps some useful ideas here: Thread 'Minimal system to charge 48v battery from 48v battery?' https://diysolarforum.com/threads/minimal-system-to-charge-48v-battery-from-48v-battery.65136/ Maybe the idea of a buck boost into an MPPT could give you the voltage needed to kick off the MPPT and...

What are the performance issues with the hotspot? Price I definitely see!

Right. I was thinking of that sensor, but working in reverse. But yeah, not thinking hard :)

Thanks. Makes me wonder, though, why don’t generators just use that technology, then no ATS no interlock etc.