Alex F
Well-Known Member
- Nov 14, 2006
- 9,166
- Boat Info
- 2005 420DB with AB 11 DLX Tender, Raymarine Electronics (2x12" MFDs) with Vesper AIS
- Engines
- Cummins 450Cs, 9KW Onan Generator, 40HP Yamaha for tender.
After spending first night on our 420DB I was faced with a new challenge. The boat has 2 hot water heaters. Both are on the same side (stbd), but on their own breakers. I had them both on and had master stateroom AC/Heater turned on (it’s also on the same stbd side). After the components were on for couple of hours the stbd side breaker on the main AC panel tripped in OFF position. I reset the breaker and short while later it tripped again.
The dock side was fine since I had 110v coming to the panel on both sides. So, it was clear to me that this is internal issue that had nothing to do with the fact that I had 50amp splitting in to 2x30amps coming in to the boat.
I started isolating the issue by turning one component at the time and had noticed that each of them (original HWH, 2nd HWH, A/C unit) uses around 10AMPs. This is when I realized that I can’t have them on at the same time. After I turned off one HWH the system stayed ON the rest of the night.
This was a surprising discovery to me. I was accustom to these issues on my 320 that had only single 30amp line, but I was hoping that on the lager models SR got their act together and figured out the proper wiring for the potential loads. Even though you don’t see many boats of this size with 2nd HWH, but we see quite often bridge or cockpit A/C.
My question is, do some of you guys (who has similar size boats) have these issues and you also have to pick and choose what unit you have on at what time or is it just my boat?
The dock side was fine since I had 110v coming to the panel on both sides. So, it was clear to me that this is internal issue that had nothing to do with the fact that I had 50amp splitting in to 2x30amps coming in to the boat.
I started isolating the issue by turning one component at the time and had noticed that each of them (original HWH, 2nd HWH, A/C unit) uses around 10AMPs. This is when I realized that I can’t have them on at the same time. After I turned off one HWH the system stayed ON the rest of the night.
This was a surprising discovery to me. I was accustom to these issues on my 320 that had only single 30amp line, but I was hoping that on the lager models SR got their act together and figured out the proper wiring for the potential loads. Even though you don’t see many boats of this size with 2nd HWH, but we see quite often bridge or cockpit A/C.
My question is, do some of you guys (who has similar size boats) have these issues and you also have to pick and choose what unit you have on at what time or is it just my boat?