The components featured in this section are those which make a good system great.  It is no good generating power if you then transfer it from one place to another inefficiently or, if storing energy, you don't know how much you have or can't establish how much you actually need.

Battery Monitors

One of the key pieces of equipment in any battery based stand-by or off-grid installation is a battery monitoring system.  It is not accurate enough to use battery voltage as the primary indication of charge state.  The state of charge of a battery bank is fundamentally the battery voltage, but temperature of the battery must be taken into account and certainly, if the battery is working (being charged or discharged), the voltage is affected and so it is not an accurate reflection of the true SoC (State of Charge) at any point in time.  Using Peukerts coefficient and an algorithm in a microprocessor coupled to a shunt, modern battery monitors can accurately establish SoC, time to run before battery exhaustion, percentage of charge remaining and alert the end user when the batteries must be recharged.

Battery Protection

Simply, these devices are installed between a battery bank and various DC consumers.  They automatically disconnect the supply of power to these consumer when the battery voltage drops below a certain level.  This protects the battery bank from total depletion (and thus potential permanent damage) should something (like a light) be left on all night.

DC-DC Converters

It is usually more efficient to store and use battery energy at a higher voltage eg 48V.  However, if you wish to use DC devices such as lights, motors or pumps which are more readily available in lower voltages like 12V or 24V, then a DCDC Converter can be employed.

Voltage Sensitive Relays

If you plan to have two independant battery banks but you only have a single source of charge and would like to charge them both up at the same time without having them permanently connected electrically, then you could use a Voltage Sensitive Relay connected between them.  When the bank connected to a form of charge is being charged, the voltage rises up and the relay closes and connects the two battery banks together.  They both now get charged as if they were one big battery bank.  When the source of charge is turned off, the voltage decays to the natural voltage of the battery under load and the relay opens - disconnecting the two batteries from one another.


The Studer and Cristec Battery Monitor Range

To view Datasheets & Manuals, click on the Downloads tab above.

Model Brand Battery Banks Monitored Aux. Battery Monitored Volt Range (VDC) Maximum Current (A)
SBM-02 Studer 1 Yes - 1 12 - 24 500
JBNUM II Cristec up to 3 Yes - 2 12 - 24 500
BSP 500 Studer 1 No 12 - 24 500
BSP 1200 Studer 1 Yes - 1 12 - 24 1200

Each battery monitoring system measures the following parameters:

Battery Voltage (V)
Current (A)
Consumed Ampere-hours (Ah)
State-of-charge (%)
Time-to-go (h:m)
Temperature (°C or °F)

The Cristec JBNUM II is supplied with one shunt to monitor one battery bank; two other shunt kits can be purchased to monitor 2 more.

The Studer MBW Battery Protection Range

MBW 40
MBW 60
MBW 200

The Studer DC-DC Converter Range

To view Datasheets & Manuals, click on the Downloads tab above.

Model Input Voltage (VDC) Output Voltage (VDC) Output Current (A) Rated Power (W)
MDC 1224-7 9-18 24.0 7 170
MDC 2412-5 18-35 13.2 5 65
MDC 2412-8 18-35 13.2 8 105
MDC 2412-12 20-35 13.5 12 160
MDC 2412-20 20-35 13.8 20 275
MDC 2412-30 20-35 13.8 30 415
MDCI 100 A/B/C/D 12.5 / 24.0 8 / 4 100
MDCI 200 A/B/C/D 12.5 / 24.0 16.5 / 8 200
MDCI 360 A/B/C/D 12.5 / 24.0 30 / 15 360
MDCI 360 A24 Charger A/B/C/D 27.6 13 360

Note: For the MDCI Range the input and output voltage options are specified at time of order.
The letters refer to the following voltages:
A = 9-18 VDC (nominally 12V)
B = 20-35 VDC (nominally 24V)
C = 30-60 VDC (nominally 48V)
D = 60-120 VDC (nominally 72V)
So, for example, if you wish to step down 24V to 12V and the device you wish to power uses 15A, then select MDCI 200 B12.

The Studer MBR Voltage Sensitive Relay Range

To view Datasheets & Manuals, click on the Downloads tab above.

Model Current Rating (A) RemoteContact Control
MBR 12/24-100 100 No
MBR 12/24-160 160 Yes
MBR 12/24-500 500 Yes
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