Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 28-06-2018, 09:52   #1
Registered User

Join Date: Dec 2009
Location: Quebec (boat currently in Sardinia)
Boat: Bruce Roberts 45 (steel) - Armonid
Posts: 96
MPPT - what to connect to load?

Just installed a Victron MPPT smart controller. It has a "load" output, that can be programmed in multiple ways.

I've connected a computer+USB charger. The idea being that I don't want to charge batteries from batteries, for the sake of efficiency.

I am wondering if I should also connect the water maker to load. It is never used at night, so that would appear to make sense.

My question is : does it make a difference for the batteries? I thought that when solar is plenty, electricity would flow to loads without drawing on the battery. So there would be no meaningful difference between the regulator's "load" and the usual connection via a distribution panel.

Can someone explain to me what "load" is meant to do?
__________________

gauvins is offline   Reply With Quote
Old 28-06-2018, 12:42   #2
Registered User
 
sparrowhawk1's Avatar

Join Date: Jan 2014
Location: Miami Beach Fl
Boat: Colombia Cc 11.8
Posts: 1,609
Re: MPPT - what to connect to load?

Like you said it's programmable so you can use it for things that you want on momentarily. one of the best uses is an anchor light, you can program it to come on at Sunset and off at dawn. The cheap ones will just do Sunset and Dawn. Another idea would be to hook up your water maker and have it turn off at say 3 p.m. allowing your batteries to be totally charged Before Sunset.
__________________

sparrowhawk1 is offline   Reply With Quote
Old 29-06-2018, 02:09   #3
Registered User

Join Date: Jun 2013
Location: canada
Posts: 2,607
Re: MPPT - what to connect to load?

on a boat I would not use it.

it's for like a porch light on a cabin.

I doubt the amps would handle a water maker. maybe trigger a relay.
smac999 is online now   Reply With Quote
Old 29-06-2018, 09:01   #4
Registered User

Join Date: Nov 2015
Location: Fl
Boat: Wauquiez Hood 38
Posts: 1,171
Re: MPPT - what to connect to load?

Just to clarify what the Load function of a Victron controller is used for as there seems to be some confusion.

From the manual..

1.3 Load output

Deep discharge of the battery can be prevented by connecting all loads to the load

output. The load output will disconnect the load when the battery has been discharged

to a pre-set voltage.

Alternatively, an intelligent battery management algorithm can be chosen: see Battery

Life.

The load output is short circuit proof.

Some loads (especially inverters) can best be connected directly to the battery, and the

inverter remote control connected to the load output. A special interface cable may be

needed, please see section 3.6.
__________________
Keth

Boat Vinyl Lettering and Graphics
Bleemus is offline   Reply With Quote
Old 29-06-2018, 18:25   #5
Registered User

Join Date: Jan 2017
Posts: 11,834
Re: MPPT - what to connect to load?

Victron's output is probably fine for any consumer type, but current is limited (10A? see the specs for your model).

A generic LVD can substitute the same functionality at higher or lower amps, priced accordingly, and good ones are adjustable.

The purpose is to isolate heavier / less essential loads as SoC drops, so the lighter / more essential consumers can keep going longer, without reducing bank lifetime by dropping to a too-low SoC before the next charge cycle.
john61ct is online now   Reply With Quote
Old 29-06-2018, 18:27   #6
Registered User

Join Date: Jan 2017
Posts: 11,834
Re: MPPT - what to connect to load?

Many cheap SCs' output is not only current-limited, but suitable for only certain loads, usually resistive only I believe.

Therefore the whole feature concept gets disparaged, but on quality units it is much more useful.
__________________

john61ct is online now   Reply With Quote
Reply

Tags
loa, mppt

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Connect MPPT to Isolator? zuzullo Electrical: Batteries, Generators & Solar 32 21-07-2018 10:58
Victron BlueSolar Charge Controller MPPT 75/115 "Load" Terminal Question PetePetePete Electrical: Batteries, Generators & Solar 5 30-04-2017 03:44
Load Dump on a Tristar MPPT 60 A? monte Electrical: Batteries, Generators & Solar 4 26-07-2012 08:45
Connect Solar Panels in Series or Parallel? gandalf Electrical: Batteries, Generators & Solar 2 27-01-2010 19:04



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:42.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.