ok so I heated the HWS last night and had a fast luke warm shower
this morning, Not really usefull.
Can I have the best of both worlds? A diverter that diverts excess solar
to the HWS as well as being able to turn it on when needed as well as having 220 at the dock
Or ... do I need 240 at the dock
or just running it from the batteries will suffice? If it takes 30 mins to heat on 220, does that mean it takes 300 mins to heat on 12V?
Is there a twin element HWS I could use or a replacement element that does both 220 and 12v? I guess there is because some RV's have 2 or 3 way systems.
Also would be nice to be able to switch on the 12v at bedtime if my batteries are 100% and know that I will have hot water
in the morning and still 90% charge.
When I did a power budget
I allowed for 250Ah/day but at anchor
Im just using 100, mostlly the fridge. I had in mind the power to run the watermaker
and the water
pump and allowed enough for nav gear
when on passage
, so I have a large excess.
Maybe the simplest is to replace the element with 12v and wire it directly to the batteries and us the switch on the power board to heat when I feel its necessary/available power?